Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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Step 1 of 2

(a).

Recall the formula for Z-score for data value x is

The z-score for 3min is

Table 13.10 indicates that 0.249 of the data is a normal distribution are betweenand. Because the data are normally distributed, 0.245 data is also betweenand. The percent of data to the right of the valueis . Thus customer spends waiting time in a grocery store will less than 3min.

Step 2 of 2

(b).

The z-score for 1min is

Table 13.10 indicates that 0.477 of the data is a normal distribution are between and. Because the data are normally distributed, 0.477 data is also between and . The percent of data to the right of the value is. Thus customer spends waiting time in a grocery store will less than 1min.